April 1981

April 1981: 1 132 companies

1. April 1981 74 companies

2. April 1981 118 companies

3. April 1981 65 companies

5. April 1981 1 companies

6. April 1981 34 companies

7. April 1981 58 companies

8. April 1981 46 companies

9. April 1981 51 companies

10. April 1981 46 companies

12. April 1981 1 companies

13. April 1981 62 companies

14. April 1981 75 companies

15. April 1981 54 companies

16. April 1981 43 companies

21. April 1981 53 companies

22. April 1981 55 companies

23. April 1981 60 companies

24. April 1981 58 companies

27. April 1981 42 companies

28. April 1981 36 companies

29. April 1981 47 companies

30. April 1981 53 companies